Statistics
| Branch: | Revision:

ffmpeg / libavutil / common.h @ 80a289b9

History | View | Annotate | Download (8.78 KB)

1 04d7f601 Diego Biurrun
/*
2
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3
 *
4 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7 04d7f601 Diego Biurrun
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
10 04d7f601 Diego Biurrun
 *
11 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
12 04d7f601 Diego Biurrun
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
18 04d7f601 Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21 983e3246 Michael Niedermayer
/**
22
 * @file common.h
23 05020c89 Reimar Döffinger
 * common internal and external api header.
24 983e3246 Michael Niedermayer
 */
25
26 de6d9b64 Fabrice Bellard
#ifndef COMMON_H
27
#define COMMON_H
28
29 1845bf1f Måns Rullgård
#include <inttypes.h>
30
31 420b073b Fabrice Bellard
#ifdef HAVE_AV_CONFIG_H
32 1a565432 Fabrice Bellard
/* only include the following when compiling package */
33 9b59c92f Michael Niedermayer
#    include "config.h"
34
35
#    include <stdlib.h>
36
#    include <stdio.h>
37
#    include <string.h>
38 56c4a184 Fabrice Bellard
#    include <ctype.h>
39 9ff18a70 Michael Niedermayer
#    include <limits.h>
40 9b59c92f Michael Niedermayer
#    ifndef __BEOS__
41
#        include <errno.h>
42
#    else
43
#        include "berrno.h"
44
#    endif
45
#    include <math.h>
46 849f1035 Måns Rullgård
#endif /* HAVE_AV_CONFIG_H */
47
48
#ifndef av_always_inline
49
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
50
#    define av_always_inline __attribute__((always_inline)) inline
51
#else
52
#    define av_always_inline inline
53
#endif
54
#endif
55
56
#ifdef HAVE_AV_CONFIG_H
57 1845bf1f Måns Rullgård
#    include "internal.h"
58 44f27b3a Fabrice Bellard
#endif /* HAVE_AV_CONFIG_H */
59 1a565432 Fabrice Bellard
60 955ab9a4 Michael Niedermayer
#ifndef attribute_deprecated
61
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
62
#    define attribute_deprecated __attribute__((deprecated))
63
#else
64
#    define attribute_deprecated
65
#endif
66
#endif
67
68 8da9266c Måns Rullgård
#ifndef INT64_C
69
#define INT64_C(c)     (c ## LL)
70
#define UINT64_C(c)    (c ## ULL)
71 0339e2b4 Måns Rullgård
#endif
72 1a565432 Fabrice Bellard
73 073b013d Michael Niedermayer
//rounded divison & shift
74 10f3005f Michael Niedermayer
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
75 d7e9533a Michael Niedermayer
/* assume b>0 */
76
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
77 c26abfa5 Diego Biurrun
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
78 02305ff3 Diego Biurrun
#define FFSIGN(a) ((a) > 0 ? 1 : -1)
79 75460b0c Michael Niedermayer
80 b8a78f41 Michael Niedermayer
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
81
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
82 d7e9533a Michael Niedermayer
83 1345f4ed Diego Biurrun
#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
84 67eca72d Michael Niedermayer
85 de6d9b64 Fabrice Bellard
/* misc math functions */
86 a77caa4d Måns Rullgård
extern const uint8_t ff_log2_tab[256];
87 de6d9b64 Fabrice Bellard
88 a822a479 Nick Kurshev
static inline int av_log2(unsigned int v)
89 de6d9b64 Fabrice Bellard
{
90
    int n;
91
92
    n = 0;
93
    if (v & 0xffff0000) {
94
        v >>= 16;
95
        n += 16;
96
    }
97
    if (v & 0xff00) {
98
        v >>= 8;
99
        n += 8;
100
    }
101 c81f0349 Michael Niedermayer
    n += ff_log2_tab[v];
102
103
    return n;
104
}
105
106
static inline int av_log2_16bit(unsigned int v)
107
{
108
    int n;
109
110
    n = 0;
111
    if (v & 0xff00) {
112
        v >>= 8;
113
        n += 8;
114 de6d9b64 Fabrice Bellard
    }
115 c81f0349 Michael Niedermayer
    n += ff_log2_tab[v];
116
117 de6d9b64 Fabrice Bellard
    return n;
118
}
119
120 45870f57 Michael Niedermayer
/* median of 3 */
121
static inline int mid_pred(int a, int b, int c)
122
{
123 d0b456ba Christophe Mutricy
#ifdef HAVE_CMOV
124 7e611a0e Loren Merritt
    int i=b;
125 93a319f1 Loren Merritt
    asm volatile(
126 7e611a0e Loren Merritt
        "cmp    %2, %1 \n\t"
127
        "cmovg  %1, %0 \n\t"
128
        "cmovg  %2, %1 \n\t"
129
        "cmp    %3, %1 \n\t"
130 93a319f1 Loren Merritt
        "cmovl  %3, %1 \n\t"
131 7e611a0e Loren Merritt
        "cmp    %1, %0 \n\t"
132
        "cmovg  %1, %0 \n\t"
133
        :"+&r"(i), "+&r"(a)
134
        :"r"(b), "r"(c)
135 93a319f1 Loren Merritt
    );
136
    return i;
137
#elif 0
138 7a62e94a Michael Niedermayer
    int t= (a-b)&((a-b)>>31);
139
    a-=t;
140
    b+=t;
141
    b-= (b-c)&((b-c)>>31);
142
    b+= (a-b)&((a-b)>>31);
143
144
    return b;
145
#else
146
    if(a>b){
147
        if(c>b){
148
            if(c>a) b=a;
149
            else    b=c;
150
        }
151
    }else{
152
        if(b>c){
153
            if(c>a) b=c;
154
            else    b=a;
155
        }
156
    }
157
    return b;
158
#endif
159 45870f57 Michael Niedermayer
}
160
161 77177335 Aurelien Jacobs
/**
162
 * clip a signed integer value into the amin-amax range
163
 * @param a value to clip
164
 * @param amin minimum value of the clip range
165
 * @param amax maximum value of the clip range
166 c6c36725 Diego Biurrun
 * @return clipped value
167 77177335 Aurelien Jacobs
 */
168 91029be7 Michael Niedermayer
static inline int clip(int a, int amin, int amax)
169
{
170 18769c0a Michael Niedermayer
    if (a < amin)      return amin;
171
    else if (a > amax) return amax;
172
    else               return a;
173 91029be7 Michael Niedermayer
}
174
175 77177335 Aurelien Jacobs
/**
176
 * clip a signed integer value into the 0-255 range
177
 * @param a value to clip
178 c6c36725 Diego Biurrun
 * @return clipped value
179 77177335 Aurelien Jacobs
 */
180 3a1fda0a Panagiotis Issaris
static inline uint8_t clip_uint8(int a)
181 3ebc7e04 Michael Niedermayer
{
182
    if (a&(~255)) return (-a)>>31;
183
    else          return a;
184
}
185
186 9dbcbd92 Michael Niedermayer
/* math */
187 14bea432 Michael Niedermayer
int64_t ff_gcd(int64_t a, int64_t b);
188 9dbcbd92 Michael Niedermayer
189 202ef8b8 Michael Niedermayer
/**
190
 * converts fourcc string to int
191
 */
192 6a85ec8d Zdenek Kabelac
static inline int ff_get_fourcc(const char *s){
193 05020c89 Reimar Döffinger
#ifdef HAVE_AV_CONFIG_H
194 202ef8b8 Michael Niedermayer
    assert( strlen(s)==4 );
195 05020c89 Reimar Döffinger
#endif
196 966df5b6 Mike Melanson
197 202ef8b8 Michael Niedermayer
    return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
198
}
199
200 e8750b00 Fred Rothganger
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
201
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
202
203 d73427e3 Guillaume Poirier
/*!
204
 * \def GET_UTF8(val, GET_BYTE, ERROR)
205
 * converts a utf-8 character (up to 4 bytes long) to its 32-bit ucs-4 encoded form
206
 * \param val is the output and should be of type uint32_t. It holds the converted
207
 * ucs-4 character and should be a left value.
208
 * \param GET_BYTE gets utf-8 encoded bytes from any proper source. It can be
209
 * a function or a statement whose return value or evaluated value is of type
210 40a08c7e Reimar Döffinger
 * uint8_t. It will be executed up to 4 times for values in the valid utf-8 range,
211
 * and up to 7 times in the general case.
212 d73427e3 Guillaume Poirier
 * \param ERROR action that should be taken when an invalid utf-8 byte is returned
213
 * from GET_BYTE. It should be a statement that jumps out of the macro,
214
 * like exit(), goto, return, break, or continue.
215
 */
216 9d82b0dd Michael Niedermayer
#define GET_UTF8(val, GET_BYTE, ERROR)\
217
    val= GET_BYTE;\
218
    {\
219
        int ones= 7 - av_log2(val ^ 255);\
220
        if(ones==1)\
221
            ERROR\
222
        val&= 127>>ones;\
223
        while(--ones > 0){\
224
            int tmp= GET_BYTE - 128;\
225
            if(tmp>>6)\
226
                ERROR\
227
            val= (val<<6) + tmp;\
228
        }\
229
    }
230 2ad1516a Michael Niedermayer
231 0e8c148b Guillaume Poirier
/*!
232 34d33769 Guillaume Poirier
 * \def PUT_UTF8(val, tmp, PUT_BYTE)
233 d73427e3 Guillaume Poirier
 * converts a 32-bit unicode character to its utf-8 encoded form (up to 4 bytes long).
234 0e8c148b Guillaume Poirier
 * \param val is an input only argument and should be of type uint32_t. It holds
235
 * a ucs4 encoded unicode character that is to be converted to utf-8. If
236
 * val is given as a function it's executed only once.
237
 * \param tmp is a temporary variable and should be of type uint8_t. It
238
 * represents an intermediate value during conversion that is to be
239
 * outputted by PUT_BYTE.
240
 * \param PUT_BYTE writes the converted utf-8 bytes to any proper destination.
241
 * It could be a function or a statement, and uses tmp as the input byte.
242
 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
243 40a08c7e Reimar Döffinger
 * executed up to 4 times for values in the valid utf-8 range and up to
244
 * 7 times in the general case, depending on the length of the converted
245 0e8c148b Guillaume Poirier
 * unicode character.
246
 */
247 360932f7 Zuxy Meng
#define PUT_UTF8(val, tmp, PUT_BYTE)\
248
    {\
249
        int bytes, shift;\
250
        uint32_t in = val;\
251
        if (in < 0x80) {\
252
            tmp = in;\
253
            PUT_BYTE\
254
        } else {\
255
            bytes = (av_log2(in) + 4) / 5;\
256
            shift = (bytes - 1) * 6;\
257
            tmp = (256 - (256 >> bytes)) | (in >> shift);\
258
            PUT_BYTE\
259
            while (shift >= 6) {\
260
                shift -= 6;\
261
                tmp = 0x80 | ((in >> shift) & 0x3f);\
262
                PUT_BYTE\
263
            }\
264
        }\
265
    }
266
267 3cd52279 Diego Biurrun
#if defined(ARCH_X86) || defined(ARCH_POWERPC)
268 8230cf02 Aurelien Jacobs
#if defined(ARCH_X86_64)
269 0775c88f Michael Niedermayer
static inline uint64_t read_time(void)
270 8230cf02 Aurelien Jacobs
{
271 bb270c08 Diego Biurrun
        uint64_t a, d;
272
        asm volatile(   "rdtsc\n\t"
273
                : "=a" (a), "=d" (d)
274
        );
275
        return (d << 32) | (a & 0xffffffff);
276 8230cf02 Aurelien Jacobs
}
277 419b8784 Diego Biurrun
#elif defined(ARCH_X86_32)
278 0775c88f Michael Niedermayer
static inline long long read_time(void)
279 b534c7f9 Michael Niedermayer
{
280 bb270c08 Diego Biurrun
        long long l;
281
        asm volatile(   "rdtsc\n\t"
282
                : "=A" (l)
283
        );
284
        return l;
285 b534c7f9 Michael Niedermayer
}
286 0775c88f Michael Niedermayer
#else //FIXME check ppc64
287
static inline uint64_t read_time(void)
288
{
289
    uint32_t tbu, tbl, temp;
290
291
     /* from section 2.2.1 of the 32-bit PowerPC PEM */
292
     __asm__ __volatile__(
293
         "1:\n"
294
         "mftbu  %2\n"
295
         "mftb   %0\n"
296
         "mftbu  %1\n"
297
         "cmpw   %2,%1\n"
298
         "bne    1b\n"
299
     : "=r"(tbl), "=r"(tbu), "=r"(temp)
300
     :
301
     : "cc");
302
303
     return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
304
}
305 8230cf02 Aurelien Jacobs
#endif
306 b534c7f9 Michael Niedermayer
307
#define START_TIMER \
308
uint64_t tend;\
309 0775c88f Michael Niedermayer
uint64_t tstart= read_time();\
310 b534c7f9 Michael Niedermayer
311
#define STOP_TIMER(id) \
312 0775c88f Michael Niedermayer
tend= read_time();\
313 d705e4a6 Michael Niedermayer
{\
314
  static uint64_t tsum=0;\
315
  static int tcount=0;\
316
  static int tskip_count=0;\
317
  if(tcount<2 || tend - tstart < 8*tsum/tcount){\
318
      tsum+= tend - tstart;\
319
      tcount++;\
320
  }else\
321
      tskip_count++;\
322 8e06f20a Loren Merritt
  if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
323 e852beee Alexander Strasser
      av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
324 d705e4a6 Michael Niedermayer
  }\
325 b534c7f9 Michael Niedermayer
}
326 0187e903 Michael Niedermayer
#else
327 115329f1 Diego Biurrun
#define START_TIMER
328 0187e903 Michael Niedermayer
#define STOP_TIMER(id) {}
329 b534c7f9 Michael Niedermayer
#endif
330
331 cea8f6f3 Luca Abeni
/* memory */
332 98145875 Luca Barbato
333
#ifdef __GNUC__
334
  #define DECLARE_ALIGNED(n,t,v)       t v __attribute__ ((aligned (n)))
335
#else
336
  #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
337
#endif
338
339 79e47000 Luca Barbato
/* memory */
340 cea8f6f3 Luca Abeni
void *av_malloc(unsigned int size);
341
void *av_realloc(void *ptr, unsigned int size);
342
void av_free(void *ptr);
343
344 79e47000 Luca Barbato
void *av_mallocz(unsigned int size);
345
char *av_strdup(const char *s);
346
void av_freep(void *ptr);
347
348 96707bb7 Fabrice Bellard
#endif /* COMMON_H */